Check if R is running in RStudio

Question

I am looking for a way to test if R is being run from RStudio. For some reason I could find the answer on google yesterday but not today, but I think it had to do with testi

Answer 1

Neat solution is now available through the startup package via the is_rstudio_console function:

startup:::is_rstudio_console()
[1] TRUE

It may be worth adding that this function checks for two environment variables, RSTUDIO, which was mentioned in the answer by @krlmr and RSTUDIO_TERM that doesn't seem to be mentioned across the preceding answers at the moment.

function ()
{
    (Sys.getenv("RSTUDIO") == "1") && !nzchar(Sys.getenv("RSTUDIO_TERM"))
}

Answer 2

This is from ?rstudio:

# Test whether running under RStudio 
isRStudio <- Sys.getenv("RSTUDIO") == "1"

There is also rstudioapi::isAvailable(), but checking this is not as reliable because RStudio doesn't seem to really need the rstudioapi package to work correctly.

Answer 3

To add to the number of nice guesses, here is a message from 2011 (Ice Age)

http://support.rstudio.org/help/discussions/problems/413-location-of-installed-packages

if (Sys.getenv("RSTUDIO_USER_IDENTITY")!= ""){
.libPaths(.Library) # Avoid additional libraries } else { # not rstudio ...